Kurzweil K2600 Musician's Manual page 472

Advanced KDFX
Using the Algorithms
source. Feedback compression tends to be more subtle, but it does not allow instantaneous
attack compression.
Atk (Attack) Time for the compressor is adjustable from 0.0 to 228.0 ms.
Rel (Release) Time for the compressor is adjustable from 0 to 3000 ms.
Smooth Time smooths the output of the expanderÕs envelope detector by putting a lowpass
Þlter in the control signal path. Smoothing will affect the Attack or Release times only when this
parameter is longer than one of the other times. The range is 0.0 to 228.0 ms.
Signal Dly (Delay) puts a small delay in the signal relative to the sidechain processing, so that
the compressor (or gate) ÒknowsÓ what the input signal is going to be before it has to act on it.
This means the compression can kick in before an attack transient arrives. In a compressor, it is
only really useful in feedback conÞguration (FdbkComprs is In). The range is 0 to 25 ms.
Ratio is the amount of gain reduction imposed on the compressed signal, adjustable from 1.0:1
(no reduction) to 100:1, and Inf:1.
Threshold is the level in dBFS (decibels relative to full scale) above which the signal begins to be
compressed. Adjustable from -79.0 to 0 dB.
MakeUpGain allows additional output gain to compensate for gain reduction in the
compressor. It works in conjunction (additive, in dB) with the Out Gain parameter. The range is
-79.0 to +24.0 dB.
Expansion
Algorithms containing Expanders have these controls:
Exp Atk (Attack), how fast the expander turns off when the input signal rises above the
threshold level, adjustable from 0.0 to 228.0 ms.
Exp Rel (Release), how fast the expander turns back on after the signal drops below the
threshold level, adjustable from 0 to 3000 ms.
Exp Ratio, how much the gain is reduced below the expansion threshold, adjustable from 1:1.1
(slight downward expansion) to 1:17 (extreme downward expansion).
Exp Threshold, the level below which the signal is expanded, adjustable from -79.0 to 0 dB.
In addition, the two-segment compressors with expander have separate Ratio and Threshold
controls for each of the compression segments.
Multiband Compression
The Multiband Compression algorithm has Attack, Release, Smooth, Signal Delay, Ratio,
Threshold, and MakeUp Gain parameters for each of the three bands (Low, Mid, and High). In
addition, it has the following:
Crossover1 and Crossover2. These set the frequencies which divide the three compression
frequency bands. The two parameters are interchangeable, so either may contain the higher
frequency value. The range is 16 to 25088 Hz, in increments of a semitone.
Gates
SC Input lets you select which input channel(s) will control the sidechain, which is responsible
for opening and closing the gate. It can be set to L, R, or the average of the two channels,
(L+R)/2.
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